function Fun() {
    const ua = window.navigator.userAgent
    function resizeFunc() {
        const clientWidth = document.documentElement.clientWidth
        const scaleRatio = clientWidth <= 1440
            ? 1440 / 1920
            : clientWidth / 1920;
        // let t = window.devicePixelRatio   // 获取下载的缩放 125% -> 1.25    150% -> 1.5

        if (ua.indexOf('Firefox') > -1) {
            $('body').css({ 'max-width': '1920px', 'max-height': '1080px', 'transform-origin': 'center top', 'transform': 'scale(' + scaleRatio + ')' });
        } else {
            $('body').css('zoom', scaleRatio)
        }
    }
    resizeFunc()
    $(window).on('resize', resizeFunc)
}